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What causes arthritis in hands?

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What is Arthritis?

Arthritis literally means “inflamed joint.” Normally a joint consists of two smooth, cartilage-covered bone surfaces that fit together as a matched set and that move smoothly against one other. Arthritis results when these smooth surfaces become irregular and don’t fit together well anymore and essentially “wear out.”

 

What causes arthritis in hands ?

Arthritis can affect any joint in the body, but it is most noticeable when it affects the hands and fingers. Each hand has 19 bones, plus 8 small bones and the two forearm bones that form the wrist. Arthritis in hands can be both painful and disabling. The most common forms of arthritis in hands are osteoarthritis, post-traumatic arthritis (after an injury), and rheumatoid arthritis. Other causes of arthritis in hands are infection, gout, and psoriasis.

 

What causes arthritis in hands ? Rheumatoid arthritis of the hand:

Arthritis in handsRheumatoid arthritis affects the cells that line and normally lubricate the joints (synovial tissue). This is a systemic condition (can affect the whole body), which means that it may affect multiple joints, usually on both sides of the body. The joint lining (synovium) becomes inflamed and swollen and erodes the cartilage and bone. The swollen tissue may also stretch the surrounding ligaments, which are the connective tissues that hold the bones together, resulting in deformity and instability. The inflammation may also spread to the tendons, which are the rope-like structures that link muscles to bones. This can result in stretching out of and ruptures of the tendons. Rheumatoid arthritis in hands is most common in the wrist and the finger knuckles.

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Signs and symptoms of rheumatoid arthritis:

Stiffness, swelling, and pain are symptoms common to all forms of arthritis in hands. In rheumatoid arthritis, some joints may be more swollen than others. There is often a sausage-shaped (fusiform) swelling of the finger. Other symptoms of rheumatoid arthritis in hands include:

  • a soft lump over the back of the hand that moves with the tendons that straighten the fingers
  • a creaking sound (crepitus) during movement
  • a shift in the position of the fingers as they drift away from the direction of the thumb
  • swelling and inflammation of the tendons that bend the fingers, resulting in clicking or triggering of the finger as it bends, and sometimes causing numbness and tingling in the fingers (carpal tunnel syndrome)
  • rupture of tendons with loss of ability to straighten or bend certain fingers or the thumb
  • unstable joints in the wrist, fingers, and thumb
  • deformity in which the middle joint of the finger becomes bent and the end joint hyperextended (Boutonnière deformity
  • hyperextension (sway-back) at the middle joint of the finger associated with a bent fingertip (swan-neck deformity

 

How arthritis in hands is diagnosed ?

Your doctor will examine you and determine whether you have similar symptoms in other joints and assess the impact of the arthritis on your life and activities. The clinical appearance of the hands and fingers helps to diagnose the type of arthritis. X-rays will also show certain characteristics of rheumatoid arthritis, such as narrowing of the joint space, swelling and diminished bone density near the joints, and erosions of the bone. If your doctor suspects rheumatoid arthritis, he or she may request blood or other lab tests to confirm the diagnosis.

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